*^^^'hnd on the Isomeric Modifications of Selenium. 511 



In a second experiment, in order to render the cooling slower, 

 I arranged the tube containing the melted selenium in the oven 



heated to 100 degrees. 



We have thus — 



/ 

 



1 



2 



3 



4 



.6 



. 7 



8 



9 



10 



11 



12 



13 



14 



15 



16 



17 



18 



19 



20 



21 



22 



23 



24 



25 



26 



27 



28 



241-6 



2298 



219-3 



510-2 



201-7 



194-4 



187-6 



181-6 



175-95 



1709 



166-4 



162-4 



158-8 



155-6 



152-9 



150-4 



148-1 



146-3 



144-7 



143-25 



142-0 



140-75 



139-65 



138-75 



137-85 



137-0 



136-25 



135-5 



134-7 



0-80 

 0-70 

 0-80 

 0-77 

 0-69 

 0-60 

 0-46 

 0-36 

 0-32 

 0-12 

 0-04 

 0-00 

 + 0-09 

 + 0-21 

 + 0-37 

 + 0-40 

 + 0-57 

 + 0-11 

 -0-48 

 0-58 

 0-53 

 0-42 

 0-32 

 0-24 

 018 

 0-15 

 0-10 

 0-12 

 0-12 



It will be remarked that the cooling proceeded almost regu- 

 larly until the 55th minute, when the thermometer indicated 

 116°-8; the rapidity of the cooling diminished then in an ano- 

 malous manner till the 75th. From the 75th to the 80th the 

 thermometer remained almost stationary ; it then entered on an 

 upward march until the 110th minute, where it showed 121°-3, a 

 temperature almost 9 degrees higher than that which was indi- 

 cated at the 80th. It then assumed anew an evidently regular 

 descending march. 



Thus the only anomaly remarked during the cooling took place 

 at about 120 degrees; and the inverse march which the thermo- 

 meter takes, proves that the solidification then makes rapid pro- 



